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JEE Main & Advanced Chemistry Classification of Elements and Periodicity in Properties / तत्त्वों का वर्गीकरण एवं गुणों में आवर्ति Question Bank Electron Affinity

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    Which one of the following arrangements represents the correct order of electron gain enthalpy (with negative sign) of the given atomic species.  [CBSE PMT 2005]

    A) \[O<S<F<Cl\]

    B) \[Cl<F<S<O\]

    C) \[S<O<Cl<F\]

    D) \[F<Cl<O<S\]

    Correct Answer: B

    Solution :

    Halogens have very high electron affinity. It may be rated that the electron affinity of fluorine is unexpectedly low \[(<Cl)\]. This may perhaps be due to small size of F atom. The value of electron gain enthalpies for \[Cl,\,F,\,S\] and O are respectively 349, 333, 200 & 142 KJ / mol hence correct order is \[Cl>F>S>O\]


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